Mercury Monterey owners have reported 2 problems related to wiring (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Monterey based on all problems reported for the Monterey.
Multiple times loss of power and ability to drive. Rpm's jumped all over and vehicle would stall or not start at all. In and out of shop over 2 months leaving me without a vehicle or driving a loaner car. Finally replaced pcm and wiring harness. Not even a year later the exact same problem is occurring again and warranty is expired. Also found out another vehicle was in the shop at the same time with the same problem.
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The contact owns a 2005 Mercury Monterey. The contact was driving approximately 25 mph when the vehicle suddenly accelerated, the contact depressed the brakes but the vehicle would not respond. After utilizing the parking brake, the vehicle stalled. The vehicle was towed to the dealer for diagnostics. The technician stated that water had entered the wiring of the computer system and caused the failure. The technician dried the wiring but the failure recurred. The vehicle was towed to the dealer again, where the technicians replaced the computer but the contact continued to experience the failure. There was also a failure with the rear passenger side sliding door, which would sporadically open with the vehicle parked and the key removed from the ignition. In addition, the fuel level gauge displayed an inaccurate amount of fuel and all of the instrument panel lights were illuminated. The vehicle was not repaired. The approximate failure mileage was 17,000. Kmj updated 5/11/12 the consumer stated the computer also was wet and caused system failure in February 2010. It was replaced then. Last brakes twice. March 12, 2012 vehicle would not reverse and raced in neutral, torque converter failed. Handicap lift failed. Updated 06/14/2012.